Albert Barnes on Acts 24:20

Or else. Since they are not here to witness against me in regard to what occurred in the temple, let these here present bear witness against me, if they can, in regard to any other part of my conduct. This was a bold appeal, and it showed his full consciousness of innocence.

Let these same here say. The Jews who are here present. Any evil doing. Any improper conduct, or any violation of the law.

While I stood before the council. The sanhedrim, Acts 23:1-10. As they were present there, Paul admits that they were competent to bear witness to his conduct on that occasion; and calls upon them to testify, if they could, to any impropriety in his conduct.

(&) "evil doing" "crime"